Answer:
an element is a substance that cannot be broken down into any other substance. each element is made up of its own type of atom, which is why each element is different and unique than the other.
Answer:
In chemistry, an element is a pure substance which cannot be broken down by chemical means, consisting of atoms which have identical numbers of protons in their atomic nuclei. The number of protons in the nucleus is the defining property of an element, and is referred to as the atomic number
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How do electrons transition between energy levels?
In the chemical reaction described by the equation, how many moles of Fe2O3 will be produced from 8 moles of Fe?
4Fe(s) + 3O2(g) ------> 2Fe2O3(s)
4
8
12
16
Answer:
4
Explanation:
4moles of Fe reacts =2moles of Fe2O3
8moles of Fe reacts=x moles of Fe2O3
cross multiply
4★X=8★2
X=16/4
X=4
HELP PLEASE
What term describes ocean water being forced onto land during a hurricane?
current
tsunami
storm surge
white cap
Answer:
Storm Surge
Explanation:
A storm surge is a rise in sea level that occurs during tropical cyclones, intense storms also known as typhoons or hurricanes.
A silver bracelet has a mass of 6grams and a volume of 0.6cubic centimeters. Calculate its density.
Answer:
The answer is 10 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{6}{0.6} \\ [/tex]
We have the final answer as
10 g/cm³Hope this helps you
The reaction nC2H4 -> (-C2H4-)n is an example of
1. saponification
2. esterification
3. polymerization
4. fermentation
Answer:
answer
polymerization
How many moles of carbon dioxide are produced from the combustion of 110 g of ch4.
Answer:
answer: 6.875 moles
Explanation:
nCH4 = nCO2 = 110/(12 + 4) = 6.875
What is a circuit? How do switches and different circuit arrangements affect how electricity flows through the circuit?
Answer:
REGULATOR - A device which controls the flow of current or voltage in a circuit to a certain desired level. RELAY - An electrical coil switch that uses a small current to control a much larger current. RELUCTANCE - The resistance that a magnetic circuit offers to lines of force in a magnetic field.
Explanation:
Rubidium, Rb, has a heat of vaporization, Hvap of 69.0 kJ/mol and an entropy of vaporization, Svap of 71.9 J/K mol. Calculate the normal boiling point of rubidium. Group of answer choices
nswer: 959.67 K or 686.67 C
Explanation:
Entropy of Vaporization (S) = Heat of Vaporization (H) / T ( boiling point) (in Kelvin)
1.) Flip the equation to have T as the product --> T = H/S
2.) We need to change H from kJ to J --> 69.0 kJ/mol --> 69000J/mol
3.) Substitute numbers in the equation --> (69000 kJ/mol) / (71.9 J/Kmol) = T
4.) T = 959.67 K or in Celcius --> 959.67 - 273 = 686.67 C
What is the major difference mentioned in regard to the difference between cartilage and bone?
A)Structure of the tissue
B Shape
C) Location in the body
D) The cells that make up each tissue
which is the correct answer
Answer:
Structure of the tissue
Explanation:
Cartilage is more soft compared to the bone
The process of erosion or landscape is an example of positive feedback. Can you describe a Feedback group that explains this process in more detail, starting with a feedback between plant, humus, and at least one more node in the network? hint: you will need to add more than one negative feedback
Answer:
The feedback mostly on the scenario mentioned is defined downwards.
Explanation:
There seem to be forces that regulate the whole mechanism as well as preserve equilibrium in every natural cycle. It is possible to divide these variables into two simple types:
Negative PositiveThe improvement throughout the natural state is attempted by negative factors as well as the positive reinforcement attempts to mitigate this improvement and approach the problem to something like the primary comfortable position.
Throughout the present situation, erosion seems to be a constructive response throughout the landform transition scenario. This additional elevation is neutralized either by the extrusion process because as landmass becomes lifted by another process. Currently, due to the extreme interplay of several other variables, this shift in landscape height can start happening. The increased height including its landform may be caused by structural elongation of both the rock body. Another mechanism that will act to improve height becomes isostatic equilibrium.So, throughout the context of landform transition, there are several forms of negative comments. The quantity of surface accessible at this site also improves as even the landmass becomes increased. As a consequence, this additional area will be filled by new occupants. Plants as well as other species may be in certain habitats. Whenever these organisms inhabit the location, the organic chemistry created by them often induces biological weathering including its rock. This again serves as a force for the shift in the landform. This excessive precipitation induces some significant erosion at either site. Finally, this reduces the elevation including its landmass and preserves the landform's primary stabilization thereby concludes the circle.Let's take a basic example including its process for suggestions. Users start whimpering if you get too cold. Your body continues to pump additional blood attributable to the whole shivering and indeed the temperature therefore raises. Throughout this circumstance, the temperature drop is a mechanism that serves to initiate the shivering, as well as the shivering attempts to recover the steady body’s temperature. Therefore the shivering case seems to be positive feedback that seeks to restore the primary balance.
Much the same for the landmass uplifting allows the emergence of more life above it. So, social advancement seems to be a system of negative criticism that disturbs the equilibrium. After that, the main elevation of the landform needs to regain the excess volume of degradation. So, this is indeed a tool for constructive feedback.
Why can’t an atom lose or gain a proton
The electrons can jump shells by releasing/gaining energy. If an atom develops a positive charge, how could it have happened? It couldn't possibly have taken on additional protons because protons and neutrons are bound by the strong nuclear force, which keeps the nucleus stable.
hydrogen 0.00009 into mass for g
Answer:
=4.12J/K - g
Explanation:
:)
Explain why leaf-cutter ants gather pieces of leaves and store them in their nests when they do not eat leaves.
Answer:
Sample response: Leaf-cutter ants gather pieces of leaves and store them in their nests to provide raw materials and food for the fungus that grows on the leaf pieces. The ants feed on the fungus, so by collecting leaves the ants are effectively able to grow their own food supply.
Explanation:
Answer:
Leaf-cutter ants gather pieces of leaves and store them in their nests to provide raw materials and food for the fungus that grows on the leaf pieces. The ants feed on the fungus, so by collecting leaves the ants are effectively able to grow their own food supply.
Explanation:
edg 2020
True or false. Singing sounds better in large rooms.
A) False
B) True
Answer:
it's true
Explanation:
Many of the factors affecting sound quality involve how sound waves bounce around the room. The more walls, the greater chance of longer reverberation. ... Ceiling height, room width, and the number of walls all contribute to determining reverberation time. Usually the larger the room, the longer the reverb time
Which chemical is necessary for a cell to go through aerobic respiration instead of anaerobic respiration?.
Answer:
Oxygen
Explanation:
Aerobic respiration specifically requires oxygen, but anaerobic respiration does not.
142.8 g of NaCl is dissolved in enough water to make a 2.3 L of solution, what is the molarity of the solution?
A solution contains 67.5 % of magnesium chloride (MgCl2) dissolved in water. What is the molality of the solution?
62.5 g of sugar (C12H22O11) was dissolved in water to produce 250 g of sugar syrup. Calculate the molality and mole fraction of sugar in the syrup. For your answer please follow this: m = 0.5 and Xsugar = 0.5
What are the mole fractions of hydrochloric acid (HCl) and water in a 48% solution? For your answer format follow this: Xsolute = 0.5 and Xsolvent = 0.5
A 0.770 M solution of potassium nitrate (KNO3) contains 1.75 mol of solute. Calculate the volume of the solution.
Stoichiometry can be used to determine the molality, molarity and volume of substances in a reaction.
What is concentration?
The term concentration refers to the amount of substance present in a solution.
1. Number of moles of NaCl = 142.8 g /52 gg/mol = 2.7 moles
Molarity = 2.7 moles/ 2.3 L = 1.17 M
2. 67.5 % of magnesium chloride implies 67.5 g of MgCl2 in 100 g of solution.
Number of moles of MgCl2 = 67.5 g/95 g/mol = 0.7 moles
molality = 0.7 moles/32.5 * 10^-3 = 21.5 m
3. Number of moles of the sugar = 62.5 g/342 g/mol = 0.18 moles
Number of moles of water = 250 g/18 g/mol = 13.9 moles
Since 1 g of water = 1 cm^3 water
Molarity = 0.18 moles/250 * 10^-3 = 0.72M
Molality = 0.18 moles/250 * 10^-3 = 0.72m
Mole fraction of sugar = 0.18/(0.18 + 13.9 ) = 0.01
Mole fraction of water = 13.9 /(0.18 + 13.9 ) = 0.99
4. A 48% solution of HCl contains 48 g of HCl in 100 g of water.
Number of moles of HCl = 48 g/36.5 g/mol = 1.3 moles
Number of moles of water = 52g/18 g/mol = 2.9 moles
Mole fraction of HCl = 1.3/(1.3 + 2.9) = 0.31
Mole fraction of water = 2.9/(1.3 + 2.9) =0.69
5. 1.75 mol = 0.770 M * V
V = 1.75 mol/0.770 M
V = 2.27 L
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what are the biggest cause of climatic variations
Answer:
As greenhouse gas emissions blanket the Earth, they trap the sun’s heat. This leads to global warming and climate change. The world is now warming faster than at any point in recorded history.
Explanation:
;)
Generating power, Manufacturing goods, and deforestation
What formula is used to determine the density of an object?
Answer:
Density = m/v, where m is mass and v is volume
[tex]\Large \boxed{\displaystyle density \ (kgm^{-3})=\frac{mass\ (kg)}{volume \ (m^3)} }[/tex]
From what philosophical tradition is chemistry said to have emerged?
Wich has more energy rolling down a hill - a bowling ball or soccer ball? Explain your answer
Answer:
Bowling ball
Explanation:
They are traveling at the same speed, but the bowling ball has more mass. The bowling ball has more kinetic energy because more force is needed to stop the rolling bowling ball. Two balls with different masses moving at the same speed have different amounts of kinetic energy.
Answer:
Explanation:
As a ball rolls downhill, its potential energy from its height is converted into kinetic energy of its motion. Potential energy is given by mass x gravity x height. So for the same height, a ball with higher mass will have more energy. A bowling ball is heavier than a soccer ball and will have more energy.
Assuming your weight is 440.55 N and the force of gravity on Earth is 9.8 m/s2 what is your mass? *
Answer:
44.95408163 kg
44.95 kg (2 decimal places)
Explanation:
Weight=Mass*Gravity
440.55=m*9.8
Make m the subject
M=440.55/9.8
M= 44.95 kg
How many moles of ammonium nitrate are in 335 mL of 0.425 M NH4NO3?
Answer:
0.142
Explanation:
Answer:
0.142 moles.
You would have to convert the algorithm to a broken down version of the compound.
NH4NO3(aq] → NH+4(aq] + NO−3(aq]
The ammonium is removed for this case, concentration gets broken down to zero.
So here, if 1 liter is equal to 10 x 10 x 10 milliliters...
use the formula of n and c to help you figure out the moles.
C is equal to N divided by V, so in that case...
N equals C times V.
C times V is 0.425, or 17 over 40 in simplest form.
From there, multiply 17 over 40 by the current moles, cross out the liters, and multiply by 335, then, 10 to the power of -3. You have to flip it to negative, because it will cancel out either way. Change the equation by the liters, and you have 0.125
Hence, your correct answer is 0.125
is chromium an element
helpppppppppppp
please
Cosider the sequence 2;5;8
1. 1 prove that none of the terms of the sequence are perfect squares
4.
A container holds 500 mL of Co, at 742 torr. What will be the volume of the Co, if the
pressure is increased to 795 torr?
GIVEN
WORK
Answer:
V2 = 0.465
Explanation:
To solve this question, we need to follow the equation below:
P1V1 = P2V2
We know that:
V1 = 500ml = 0.5L (must be convert to L)
P1 = 742 torr (must be convert to atm by divided by 760) = 0.976 atm
P2 = 795 torr = 1.05 atm
V2 = ?
P1V1 = P2V2
0.976 x 0.5 = 1.05 x V2
0.488 = 1.05 x V2
(Divided by side by 1.05 to get rid of it)
V2 = 0.465
Matter has two basic properties: physical properties and
chemical properties. Which of these statements best
describes physical properties?
A) Physical properties behave identically for all matter under
the same conditions.
B) Physical properties can be observed without changing the
identity of a substance.
C) Physical properties are observed by seeing how a
substance reacts with other substances.
D) Physical properties cause atoms and molecules to change
structure when substances are mixed.
Answer:
B
Explanation:
Physical property can be observed without changing the property of substance for example it color, density, and etc.
Chemical property is what C explains as it is how it reacts with other substance
Answer:
physical properties are the can be seen
Explanation:
Example.one physical property of iodine is cluster like when it is solid
3. A chemist collects 59.0 mL of sulfur dioxide gas on a day when the atmospheric pressure is 0.989 atm. On the
next day, the pressure has changed to 0.967 atm. What will the volume of the SO2 gas be on the second day?
Answer:
We have a chemist who collects 59 ml of S. 0. 2 at the pressure atmospheric pressure. Also, this one is considered as proven. We one and this one is pretty even so this is 0.989 atmospheres. Now is the second day the pressure atmospheric pressure was 0.967 atmospheres. Then what is the pressure of sulfur dioxide in the flask? Oh, so if you see here, we know that the one we want is equal to P two. We do so from the ideas equation. So this one is equal to what we want we do so we do is equal to P one. We want we do. Then it is equal to P one is 59 B one and B one is 0.989 and debated by 0.967 atmospheres. So this one is atmospheres and atmospheres and this one is Ml. So here the 0.967 atmospheric pressure is 60.34 ML approximating so this is the pressure of the gas at 0.967 on the second day.
Hope it helps!!!Brainliest pls!!!
The concept Boyle's law is used here to determine the new volume of sulphur dioxide. Boyle’s law was put forward by the Anglo-Irish chemist Robert Boyle in the year 1662. Here the new volume is 60.34 mL.
What is Boyle's law?A gas law known as Boyle's law asserts that a gas's pressure is inversely proportional to its volume when it is held at a fixed temperature and of a given mass. To put it another way, as long as the temperature and volume of the gas remain constant, the pressure and volume of the gas are inversely proportional to one another.
For a gas, the relationship between volume and pressure (at constant mass and temperature) can be expressed mathematically as follows.
P = k*(1/V) ⇒ PV = k
For two different gases, the equation is:
P₁V₁ = P₂V₂
V₂ = P₁V₁ / P₂
0.989 × 59.0 / 0.967 = 60.34 mL
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How are oxygen and ozone alike and different? Explain.
Answer:
oxygen and ozone are different because they are made up of 3 oxeygen atoms
Explanation:
how many moles are in 654.5 grams of AgCl
Answer:
The molar mass is known to be 98.96 g/mol. 71.65g Clx. = 2.021mdl C1/2021 = 1. CH₂Cl. Jund Cl.
Explanation: